(1)Change the traditional mode of power drive drive of negative pressure exhaust fan with patented design.

(2)Motor is directly connected to the blades,making motor power transmission more effective.Connected more firmly,without the belt wear,longer service life.Effectively reduce the intermediate process of power driving,running more stable,bigger effective air flow.

ircle installation hanging rings can be customized to facilitate installation

Experiment proved in order to get the best ventilation effect optimum installation site lies in the right above of the feeding rough distance between the fan bottom and ground is 2.7minclination angle is better15° to 30°